On our internal wiki, the recent changes to the Special:MovePage namespace selector cause mistakes on a daily basis. In particular, pages often end up in the wrong namespace due to the addition of a dropdown for the namespace selection (some releases ago) and the delayed loading of the dropdown itself in order to apply some styles. Years of practice with the dropdown have not improved things.

I'll try to disable such changes via some hook, but I suspect a change in core is needed to allow local configuration.